CVE-2025-2783
CVE-2025-2783 is a security flaw in Chrome and other Chromium browsers, the open-source browser that Chrome, Edge, Brave and Opera are built on. Attackers can get past a security protection in Chrome and other Chromium browsers. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 27 Mar 2025.[1]
Chrome and other Chromium browsers is in things households have, such as phones, computers, browsers and everyday apps, so the fix matters at home as much as at work. Fixed in version 134.0.6998.177 of Chrome.
Description
CISA calls it a sandbox escape in Google Chromium Mojo. In its words: “Google Chromium Mojo on Windows contains a sandbox escape vulnerability caused by a logic error, which results from an incorrect handle being provided in unspecified circumstances. This vulnerability could affect multiple web browsers that utilize Chromium, including, but not limited to, Google Chrome, Microsoft Edge, and Opera.”[1]
It scores 8.3 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by the organisation that published the CVE using CVSS 3.1.[2]
Affected versions
NVD’s record lists one fixed version: everything before it is affected.[2]
| Product | Fixed in |
|---|---|
| Chrome | 134.0.6998.177 |
Every device with Chrome and other Chromium browsers needs the update.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 27 Mar 2025, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 17 Apr 2025 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at 9%. That’s in the top 5% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Google has published a fix or advice.[3] CISA’s required action: “Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Update Chrome and other Chromium browsers now.Chrome updates itself, but only finishes when you restart it: open the menu, choose Help, then About Google Chrome, and click Relaunch. Edge, Brave, Opera and Vivaldi need the same. Then turn on automatic updates, so the next fix arrives on its own.
- Check you’re on 134.0.6998.177 or later.Fixed in version 134.0.6998.177 of Chrome. Anything older is what attackers are going after.
- If there’s no update, stop using it.CISA’s advice when a flaw being used in attacks has no fix is to stop using the product until it does.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 8.3.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 9%.[4] |
See also
Other Chrome and other Chromium browsers flaws
- CVE-2022-3075: insufficient data validation ·
Other Google flaws
- CVE-2026-111497, Google Brotli: unchecked return value ·
- CVE-2026-58704, Google Pixel: improper authorization ·
- CVE-2026-87491, Chrome and other Chromium browsers: out of bounds write ·
- CVE-2026-85046, Chrome and other Chromium browsers: type confusion ·
- CVE-2026-11645, Chrome and other Chromium browsers: out-of-bounds read and write ·
Similar flaws
- CVE-2026-102764, BeyondTrust Remote Support: authentication bypass by spoofing ·
- CVE-2025-61624, Fortinet products: path traversal ·
- CVE-2026-105133, AhsayCBS: improper authentication ·
- CVE-2015-3306, ProFTPD: improper access control ·
- CVE-2026-104286, Fortinet FortiMail: path traversal ·
Every Google flaw on CISA’s list · Everything added in March 2025
References
- ^ Cybersecurity and Infrastructure Security Agency. “Google Chromium Mojo Sandbox Escape Vulnerability”. Known Exploited Vulnerabilities Catalog, added 27 Mar 2025.
- ^ National Institute of Standards and Technology. “CVE-2025-2783 Detail”. National Vulnerability Database, published 26 Mar 2025.
- ^ Google. Advisories and fixes: chromereleases.googleblog.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.092, percentile 95.4, 31 Oct 2026.
- CVE Program. “CVE-2025-2783”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.